“On set of @GreysABC 1st day shooting Season 10 almost over! Guess which of our princesses' shoes these are?” he captioned the pic below of someone’s sneakers.

Since Grey’s fans are so whip-smart, they figured out it was Camilla Luddington (Jo Wilson) pretty quickly. We could attempt to speculate what she was doing, but since it looks like she was just sitting down, there isn’t much to say. Relaxing after a stressful work day? Probably, given what the stars are saying about the premiere. Ellen Pompeo (Meredith Grey) said it will make fans “cry and laugh” and that they’ll need vodka. Oy.

Are you nervous about the premiere? Sound off with your thoughts below!